#define  _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main() {
    int n = 0;
    scanf("%d", &n);
    char arr[14] = { 0 };
    int i = 0;
    int k = 0;
    while (n)
    {
        if (k != 0 && k % 3 == 0)
            arr[i++] = ',';
        arr[i++] = n % 10 + '0';
        n /= 10;
        k++;
    }
    int j = 0;
    for (j = i - 1; j >= 0; j--)
    {
        printf("%c", arr[j]);
    }
    return 0;
}